Front and rear four-claw equal-force wheelchair tightening and fixing device
By designing the front and rear four-claw wheelchair tightening fixing device, and using wire ropes and four-link mechanisms to achieve safe fixation of the wheelchair, the problems of unsafe and uneven loading of the wheelchair in the prior art are solved, and riding comfort and stability are improved.
Patent Information
- Application Number
- CN202422928515.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-11-29
AI Technical Summary
The existing welfare wheelchair cannot be fixed during the process of getting on and off the vehicle, the operation is complicated and unsafe, and the uneven force at the fixed position at four points leads to poor riding comfort.
A front and rear four-claw isotropic wheelchair tightening fixing device is designed, and two symmetrically arranged wheelchair fixed wire ropes are used to achieve force balance through pulley assembly and four-link mechanism. The motor drives the double-head left and right rotary screws to adjust the four-link mechanism to ensure that the four fixing points of the wheelchair are subjected to uniform force.
It realizes safe fixation of the wheelchair during the vehicle's get on and off, simplifies operation, improves riding comfort and stability, ensures that the four fixed points are equally stressed, and improves the user experience.
Smart Images
Figure CN223279014U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of automation technology, and in particular relates to a front and rear four-claw equal-force wheelchair tightening and fixing device. Background Art
[0002] Currently, wheelchairs used in welfare vehicles are not secured during boarding and exiting, requiring passengers to move freely. Even inside a welfare vehicle, personnel must operate the wheelchair fasteners at the rear and front of the vehicle to secure the wheelchair before securing the passenger with a three-point seatbelt. This process is unsafe, complex, and inconvenient. Even when the wheelchair is secured with a fastener, it doesn't ensure uniform force at all four locations, resulting in extremely poor riding comfort for passengers with limited mobility. Utility Model Content
[0003] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a wheelchair tightening and fixing device with front and rear four-claws and equal force.
[0004] In order to solve the above technical problems, the utility model provides a front and rear four-claw equal-force wheelchair tightening and fixing device, comprising two symmetrically arranged wheelchair fixing steel ropes, each wheelchair fixing steel rope having hooks at both ends for fixing the wheelchair, and the middle part of each wheelchair fixing steel rope being connected to a steel rope guide mechanism, the steel rope guide mechanism cooperates with the wheelchair fixing steel rope to form a pulley assembly, the pulley assembly is connected to a four-bar linkage mechanism, the four-bar linkage mechanism is arranged in cooperation with a double-headed left and right rotating screw rod, the two ends of the double-headed left and right rotating screw rod have threaded sections with opposite rotation directions, each threaded section is arranged with a movable nut, and the nut is hinged to one end of the four-bar linkage mechanism.
[0005] This utility model uses two steel wire ropes with hooks to secure a wheelchair from both sides. The steel wire ropes and guide mechanism form a pulley assembly. Due to the principle of force balance, the two hooks on the same wheelchair fixing wire on the same pulley assembly are subjected to equal forces. Each wheelchair fixing wire, through its hook, simultaneously acts on the front and rear axles on one side of the wheelchair, ensuring that the front and rear forces on the same side of the wheelchair are equal.
[0006] The optimized technical solution of this utility model is as follows:
[0007] Furthermore, the wire rope guiding mechanism includes a connecting plate, a slider, a pressure plate and a U-shaped guide wheel. The slider is installed on a guide rail extending forward and backward and can move forward and backward along the guide rail. The connecting plate is installed on the slider. The U-shaped guide wheel is installed on the connecting plate. The wheelchair fixing wire rope passes through the U-shaped guide wheel, and the pressure plate is arranged on the U-shaped guide wheel.
[0008] With this structure, the rotation of the double-ended left and right screws drives the two nuts to rotate left and right, thereby causing the four-bar linkage to close in the middle or open to the sides. During the movement of the four-bar linkage, the four-bar linkage can move the slider forward and backward along the guide rail, thereby adjusting the wire rope.
[0009] Furthermore, the front and rear diagonal joints of the four-bar linkage are fixedly mounted on the connecting plate of the slider by means of screws with drilled holes.
[0010] Furthermore, washers are provided at the connection points between the reaming screw and the front and rear diagonal joints of the four-bar linkage.
[0011] Furthermore, the four-bar linkage is composed of four connecting rods connected end to end, and the four-bar linkage has four joints: front, rear, left and right, wherein the left and right diagonal joints are respectively provided with nuts, and the nuts are sleeved on the threaded sections of the double-headed left and right screw rods, and the front and rear diagonal joints are respectively connected to the sliders through hinged hole screws.
[0012] Furthermore, the double-headed left and right rotating screws are driven by a motor, and both ends of the double-headed left and right rotating screws are respectively installed in bearing seats, the bearing seats are installed on fixed brackets, and the fixed brackets are installed on the base plate.
[0013] Furthermore, the cross-section of the fixed bracket is an isosceles triangle, the bearing seat is installed at the vertex of the fixed bracket, and guide wheels are respectively provided at two points on the bottom edge of the fixed bracket. The wheelchair fixing wire rope passes through the guide wheels and is connected to the wheelchair set on the fixed bracket.
[0014] Furthermore, the bottom plate is provided with a cover shell to play the role of dust prevention, safety protection and decoration.
[0015] Furthermore, the width of the base plate is smaller than the width of the wheelchair.
[0016] This device, used for securing a wheelchair, provides equal force at the four fixing points of the wheelchair. Furthermore, the device can be installed inside a vehicle or on other wheelchair access devices. It can be used without having to enter the vehicle to secure the wheelchair. This is not only convenient, but also, because the four fixing points of the wheelchair have the same force, the wheelchair occupant will not experience discomfort during travel due to varying forces at the four points. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is the main view of the utility model.
[0018] Figure 2 It is a top view of the utility model.
[0019] Figure 3This is a partial cross-sectional enlarged view of the fixing method of the two ends of the double-headed left-right rotating screw rod of the present invention.
[0020] Figure 4 This is a schematic diagram of the connection relationship between the nut and the four-bar linkage in the present utility model.
[0021] Figure 5 It is a structural diagram of the wire rope guide mechanism in the utility model.
[0022] In the figure: 1. Base plate, 2. Fixed bracket, 3. Bearing seat, 4. Connecting plate, 5. Wheelchair fixing wire rope, 6. Wheelchair, 7. Double-headed left and right rotating screw, 8. Slider, 9. Four-bar linkage, 10. Motor, 11. Controller, 12. Nut, 13. Gasket, 14. Guide rail, 15. Reamed hole screw, 16. Pressure plate, 17. U-shaped guide wheel, 18. Cover. DETAILED DESCRIPTION Example 1
[0023] This embodiment provides a front and rear four-claw equal force wheelchair tightening and fixing device, the structure of which is as follows: Figures 1 to 5 As shown, the wheelchair assembly comprises two symmetrically arranged wheelchair-fixing steel cables 5. Each wheelchair-fixing steel cable 5 has hooks at both ends for securing the wheelchair 6. A wire rope guide mechanism is connected to the middle of each wheelchair-fixing steel cable 5. This wire rope guide mechanism, in conjunction with the wheelchair-fixing steel cables 5, forms a pulley assembly. Due to the principle of force balance, the two hooks on the same wheelchair-fixing steel cable 5 are subjected to equal forces on the same pulley assembly. Each wheelchair-fixing steel cable 5, through its hooks, simultaneously acts on the fixed positions of the front and rear wheelchair axles on one side of the wheelchair 6, ensuring that the front and rear forces on the same side of the wheelchair 6 are equal. The pulley assembly is connected to a four-bar linkage 9, which is coupled to a double-ended left and right screw rod 7. The double-ended left and right screw rod 7 has threaded sections at each end that rotate in opposite directions. Each threaded section is provided with a movable nut 12, which is hinged to one end of the four-bar linkage.
[0024] The wire rope guide mechanism includes a connecting plate 4, a slider 8, a pressure plate 16, and a U-shaped guide wheel 17. The slider 8 is mounted on a guide rail 14 extending forward and backward and can move forward and backward along the guide rail 14. The connecting plate 4 is mounted on the slider 8, and the U-shaped guide wheel 17 is mounted on the connecting plate 4. The wheelchair securing wire rope 5 passes through the U-shaped guide wheel 17. The pressure plate 16 is located on the U-shaped guide wheel 17. The U-shaped guide wheel 17 is a nylon wheel with a U-shaped groove, a bearing in the middle and a U-shaped groove around the perimeter. The wheelchair securing wire rope 5 passes through the U-shaped groove. The U-shaped guide wheel 17 is mounted on the connecting plate 4 and secured by the pressure plate 16. The pressure plate 16 not only secures the U-shaped guide wheel 17 but also restrains the wheelchair securing wire rope 5. The front and rear diagonal joints of the four-bar linkage 9 are fixed to the slider 8 via screws 15 that extend through the connecting plate 4. Washers 13 are provided at the junctions between the screws 15 and the front and rear diagonal joints of the four-bar linkage 9.
[0025] The four-bar linkage 9 consists of four connecting rods connected end to end, with four joints at the front, rear, left, and right sides. The left and right diagonal joints are respectively connected to left and right nuts 12, which are mounted on the left and right threaded sections of the double-ended left and right screw rod 7. The front and rear diagonal joints are respectively connected to the slider 8 via tapped screws 15. The double-ended left and right screw rod 7 is connected to two nuts 12. The rotation of the screw rod controls the distance between the front and rear joints of the four-bar linkage 9, thereby adjusting the distance between the two sliders 8. This pulley assembly mounted on the slider 8 is then pulled to tighten the wheelchair securing cable 5.
[0026] The double-headed left and right rotating screw 7 is driven to rotate by a motor 10, and the motor 10 is connected to a controller 11. A bearing seat 3 is installed at each end of the double-headed left and right rotating screw 7. The bearing seat 3 is installed on a fixed bracket 2. There are two fixed brackets 2, which are symmetrically installed on the base plate 1. The width of the base plate 1 is smaller than the width of the wheelchair 6. The base plate 1 is provided with a cover 18. The cover 18 plays a role in dust prevention, safety protection and decoration for the base plate 1 and the structure thereon. The cross-section of the fixed bracket 2 is an isosceles triangle. The bearing seat 3 is installed at the vertex of the fixed bracket 2. A steering guide wheel is provided at two points on the bottom edge of the fixed bracket 2. The wheelchair fixing wire rope 5 passes through the steering guide wheel to achieve steering and is connected to the wheelchair 6 set on the fixed bracket 2. The outer side of the fixed bracket 2 has a certain slope, which can limit the movement of the wheelchair 6.
[0027] The present invention comprises two pulley assemblies, each of which is mounted on a guide rail 14 via a slider 8. The two pulley assemblies are connected by a four-bar linkage 9. A controller 11 controls a motor 10 to rotate a double-ended left and right screw rod 7, which in turn drives two nuts 12 mounted on the double-ended left and right screw rod 7 to move, thereby adjusting the relative position of the slider 8. The two ends of the double-ended left and right screw rod 7 are respectively fixed by a set of bearing blocks 3, which are fixed to a fixed bracket 2. When the tension of the wheelchair fixing wire rope 5 on one side is greater, the slider 8 on the side with less tension will move more, while the side with greater tension will move less. Based on the principle of force balance, the slider 8 is ultimately positioned at a position where the forces on both sides are equal, achieving the goal of equal tension at the four fixed points on both sides.
[0028] The wheelchair fixing mechanism of the utility model has equal pulling forces at four points, and the wheelchair fixing operation is more convenient than the traditional one, thereby improving the riding comfort, stability and reliability of the wheelchair user, and has a simple structure, and is convenient for use on vehicles or other mechanisms.
[0029] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present invention.
Claims
1. A front and rear four-claw equal force wheelchair tightening and fixing device, characterized by: It includes two symmetrically arranged wheelchair fixing steel ropes, each wheelchair fixing steel rope is provided with a hook for fixing the wheelchair at both ends, the middle part of each wheelchair fixing steel rope is connected to the steel rope guide mechanism, the steel rope guide mechanism cooperates with the wheelchair fixing steel rope to form a pulley assembly, the pulley assembly is connected to the four-bar linkage, the four-bar linkage is cooperated with the double-headed left and right rotating screw rods, the two ends of the double-headed left and right rotating screw rods have threaded sections with opposite rotation directions, each threaded section is arranged with a movable nut, and the nut is hinged to one end of the four-bar linkage.
2. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 1, characterized in that: The wire rope guide mechanism includes a connecting plate, a slider, a pressure plate and a U-shaped guide wheel. The slider is installed on a guide rail extending forward and backward and can move forward and backward along the guide rail. The connecting plate is installed on the slider. The U-shaped guide wheel is installed on the connecting plate. The wheelchair fixing wire rope passes through the U-shaped guide wheel. The pressure plate is provided on the U-shaped guide wheel.
3. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 1, characterized in that: The front and rear diagonal joint points of the four-bar linkage are fixedly mounted on the connecting plate of the slider via screws with hinged holes.
4. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 3, characterized in that: Washers are provided at the connection points between the reaming hole screw and the front and rear diagonal joints of the four-bar linkage.
5. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 1, characterized in that: The four-bar linkage is composed of four connecting rods connected end to end. The four-bar linkage has four joint points: front, rear, left and right. The left and right diagonal joint points are respectively provided with nuts, and the nuts are sleeved on the threaded sections of the double-headed left and right screw rods. The front and rear diagonal joint points are respectively connected to the slider through hinged hole screws.
6. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 1, characterized in that: The double-headed left and right rotating screws are driven by a motor. Both ends of the double-headed left and right rotating screws are respectively installed in bearing seats. The bearing seats are installed on a fixed bracket, and the fixed bracket is installed on a bottom plate.
7. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 6, characterized in that: The cross-section of the fixed bracket is an isosceles triangle, the bearing seat is installed at the vertex of the fixed bracket, and guide wheels are respectively provided at two points on the bottom edge of the fixed bracket. The wheelchair fixing wire rope passes through the guide wheels and is connected to the wheelchair set on the fixed bracket.
8. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 7, characterized in that: The bottom plate is provided with a cover shell.
9. The front and rear four-claw equal-force wheelchair tightening and fixing device according to claim 7, characterized in that: The width of the bottom plate is smaller than the width of the wheelchair.